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attachment:"2012 아주대 정보통신대학_0808.pdf"
$= \sqrt{\frac{S_p^2}{n_a} + \frac{S_p^2}{n_b}}$
$= \frac{SS_a+SS_b}{df_a+df_b}$
$=\sqrt{\frac{\sigma^2}{n}}$


$= \sqrt{\frac{S_p^2}{n_a} + \frac{S_p^2}{n_b}}$

$= \frac{SS_a+SS_b}{df_a+df_b}$

$=\sqrt{\frac{\sigma^2}{n}}$

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